{4594} Primeσήμερονsemeron{say'-mer-on}Neuter (as adverb) of a presumed compound of the article G3588 ('tau' changed to 'sigma') and G2250; on the (that is, this) day (or night current or just passed); genitively now (that is, at present, hitherto).

{2532} Primeκαίkai{kahee}Apparently a primary particle, having a copulative and sometimes also a cumulative force; and, also, even, so, then, too, etc.; often used in connection (or composition) with other particles or small words.

{3825} Primeπάλινpalin{pal'-in}Probably from the same as G3823 (through the idea of oscillatory repetition); (adverbially) anew, that is, (of place) back, (of time) once more, or (conjugationally) furthermore or on the other hand.

{0846} Primeαὐτόςautos{ow-tos'}From the particle αὖ [[au]] (perhaps akin to the base of G0109 through the idea of a baffling wind; backward); the reflexive pronoun self, used (alone or in the compound of G1438) of the third person, and (with the proper personal pronoun) of the other persons.

{2532} Primeκαίkai{kahee}Apparently a primary particle, having a copulative and sometimes also a cumulative force; and, also, even, so, then, too, etc.; often used in connection (or composition) with other particles or small words.

{0846} Primeαὐτόςautos{ow-tos'}From the particle αὖ [[au]] (perhaps akin to the base of G0109 through the idea of a baffling wind; backward); the reflexive pronoun self, used (alone or in the compound of G1438) of the third person, and (with the proper personal pronoun) of the other persons.

_ _ this day have I begotten thee  (Psalms 2:7). Fulfilled at the resurrection of Jesus, whereby the Father “declared,” that is, made manifest His divine Sonship, heretofore veiled by His humiliation (Acts 13:33; Romans 1:4). Christ has a fourfold right to the title “Son of God”; (1) By generation, as begotten of God; (2) By commission, as sent by God; (3) By resurrection, as “the first-begotten of the dead” (compare Luke 20:36; Romans 1:4; Revelation 1:5); (4) By actual possession, as heir of all [Bishop Pearson]. The Psalm here quoted applied primarily in a less full sense to Solomon, of whom God promised by Nathan to David. “I will be his father and he shall be my son.” But as the whole theocracy was of Messianic import, the triumph of David over Hadadezer and neighboring kings (2 Samuel 8:1-18; Psalms 2:2, Psalms 2:3, Psalms 2:9-12) is a type of God’s ultimately subduing all enemies under His Son, whom He sets (Hebrew, “anointed,” Psalms 2:6) on His “holy hill of Zion,” as King of the Jews and of the whole earth. the antitype to Solomon, son of David. The “I” in Greek is emphatic; I the Everlasting Father have begotten Thee this day, that is, on this day, the day of Thy being manifested as My Son, “the first-begotten of the dead” (Colossians 1:18; Revelation 1:5). when Thou hast ransomed and opened heaven to Thy people. He had been always Son, but now first was manifested as such in His once humbled, now exalted manhood united to His Godhead. Alford refers “this day” to the eternal generation of the Son: the day in which the Son was begotten by the Father is an everlasting to-day: there never was a yesterday or past time to Him, nor a to-morrow or future time: “Nothing there is to come, and nothing past, but an eternal NOW doth ever last” (Proverbs 30:4; John 10:30, John 10:38; John 16:28; John 17:8). The communication of the divine essence in its fullness, involves eternal generation; for the divine essence has no beginning. But the context refers to a definite point of time, namely, that of His having entered on the inheritance (Hebrews 1:4). The “bringing the first-begotten into the world” (Hebrews 1:6), is not subsequent, as Alford thinks, to Hebrews 1:5, but anterior to it (compare Acts 2:30-35).

Hebrews 1:5

Thou art my Son  God of God, Light of Light. This day have I begotten thee  I have begotten thee from eternity, which, by its unalter able permanency of duration, is one continued, unsuccessive day. I will be to him a Father, and he shall be to me a Son  I will own myself to be his Father, and him to be my Son, by eminent tokens of my peculiar love The former clause relates to his natural Sonship, by an eternal, inconceivable generation; the other, to his Father's acknowledgment and treatment of him as his incarnate Son. Indeed this promise related immediately to Solomon, but in a far higher sense to the Messiah. Psalms 2:7; 2 Samuel 7:14

Hebrews 1:5

(5) For unto which of the angels said he at any time, Thou art my Son, (k) this day have I begotten thee? (6) And again, I will be to him a Father, and he shall be to me a Son?

(5) He proves and confirms the dignity of Christ revealed in the flesh, by these six evident testimonies by which it appears that he far surpasses all angels, so much so that he is called both Son, and God in (Hebrews 1:5-8, Hebrews 1:10, Hebrews 1:13).

(k) The Father begat the Son from everlasting, but that everlasting generation was revealed and represented to the world in his time, and therefore he added this word "Today" (6) He proves and confirms the dignity of Christ revealed in the flesh, by these six evident testimonies by which it appears that he far surpasses all angels, so much so that he is called both Son, and God in (Hebrews 1:5-8, Hebrews 1:10, Hebrews 1:13).

Thou:

Hebrews 5:5 So also Christ glorified not himself to be made an high priest; but he that said unto him, Thou art my Son, to day have I begotten thee.Psalms 2:7 I will declare the decree: the LORD hath said unto me, Thou [art] my Son; this day have I begotten thee.Acts 13:33 God hath fulfilled the same unto us their children, in that he hath raised up Jesus again; as it is also written in the second psalm, Thou art my Son, this day have I begotten thee.

I will:

2 Samuel 7:14I will be his father, and he shall be my son. If he commit iniquity, I will chasten him with the rod of men, and with the stripes of the children of men:1 Chronicles 17:13I will be his father, and he shall be my son: and I will not take my mercy away from him, as I took [it] from [him] that was before thee:1 Chronicles 22:10He shall build an house for my name; and he shall be my son, and I [will be] his father; and I will establish the throne of his kingdom over Israel for ever.1 Chronicles 28:6 And he said unto me, Solomon thy son, he shall build my house and my courts: for I have chosen him [to be] my son, and I will be his father.Psalms 89:26-27 He shall cry unto me, Thou [art] my father, my God, and the rock of my salvation. ... Also I will make him [my] firstborn, higher than the kings of the earth.